Pump-piston packing-adjusting mechanism



Jan. 21, 1930.

' W. F. M MAHON PUMP PISTON PACKING ADJUSTING MECHANISM Filed April 14. 1926 [XVIII/Willi!!! Patented Jan. 21, 19 30 UNITED srA WILLIAM rannnn'rcx McMAEON, or RIVERSIDE, cnmnomvra PUMP-PISTON BACKINIFADJ USTIN G MECEANISE r'Application filed April 14',

This invention relates to new and useful improvements in pump piston packing adjusting mechanism as applied to reciprocating pumps. i

By referring to the drawings of the Patent No. 1,474,201, granted to me on the 13th day of November, 1923, it will readily be seen that the design as represented inthe annexed drawings is substantially the same construction and elements as shown in said Patent No. 1,474,201. However by using-substantially the same elements,'form, proportion and details of construction as shown in Patent No. 1,474,201, with a different method of 15 operation than that described in said Patent No. 1,474,201, I obtain a new and useful result in connection with the adjusting of the pump piston packing, having several important eatures as its object among which may be noted first;

That of means, located between the steam cylinder and the water pump cylinder of a steam reciprocating pump, in. connection with the water pump piston rod, to adjust the packing of the water pump piston.

Second; to provide means to vary the wearing points of the water pump piston when the packing in same is being positively adjusted, Without dismantling any part of the pump.

Third; to prevent freezing or jamming of the water pump piston in the water liner of the pump, as is often the main trouble in v a fpiston when the piston acking-at the time o adjustment is not revo ved, or when same is being wedged out in one place in the water linerin the pump at each adjustment.

Fourth; to provide a different wearing point in the water liner each time the pump piston packing is'adjusted by a positive acting mechanism.

With these and other objects in view the invention resides and consists in the construction and novel combination and arrangement of parts hereiafter more fully described and illustrated in the accompanying drawings, and pointed out in the claims hereto a pended, it being understood that variou'schanges in the form, proportion, size and minordetails of construction within the scope of the 1926. Serial 1T0. 101,969.

\ claims may be resorted to Without departure or corresponding parts throughout the several figures of the accompanying drawings forming a part of this specification and upon which--v Y 1 v Fig. 1 is a longitudinal. sectional elevation through the. pump piston, showing same mounted in the water liner of the pump.

. Fig. 2 is a cross sectional view'through the center of the piston packing in the pump piston, showing the formation of the interlocking jaws. f f

Fig. 3 is a diagrammatic plan view, of the interlocking jaws showing the jaws in mesh;

Fig. 4 is a diagrammatic assembled view ofthe piston unit of a reciprocating pump actuated by steam, showing the lever element in position. Referring in detail to the characters of reference marked upon the drawings 8'represents the water liner in which the pump piston 3 moves in. an inward and outward re ciprocating movement through the medium of steam pressure acting on the driving piston 2. The driving piston 2 is connected to the pump piston 3by a piston rod made up of, two sections, each section 4 and 6 connected together by a crosshead 5 centrally located between the driving piston 2- and the' water pump piston 3. The section of the piston rod between the driving piston 2 and the crosshead 5 is one solid rod 4, while the section of the piston rod between the crosshead 5 and the water pump piston 3 comprises two members 6 and 13, viz a rod 13 Within a rod 6, the outer rod 6 being in compression during the outward stroke of the driving piston 2 and performsv the function of a'tubular piston rod 6, and the rod within the tubular piston rod 6 is in tension during the inward stroke of driving piston 2 and performs the function of a solid piston rod 13. As described in my 95 Patent No. 1,474,201 both these rods 6 and 13 are fixed against longitudinal movement and have engagement with the water pump piston3, y

- The solid piston rod 13 on one end portion 100 has threaded engagement 1 with the crosshead 5 and on the other end portion has threaded engagement 17 with member 14 of the water pump piston 3. The threaded engagement of this rod 13 with the crosshead 5 fixes said rod against longitudinal movement.

The tubular piston rod 6 is mounted on solid piston rod 13 and is threaded on the crosshead 5 end portion to provide engagement for a locknut 12, on this end portion it also butts up against the upset end of rod 13, on the other end portion I have provided a threaded end 11 that makes a fixed and tight joint with member 7 of'the water pump piston 3.

The-water pump piston 3 comprises two members 7 and 14, one 14 being longitudinally adjustable relatively to the other 7, and a packing 23 between said members 7 and 14 adapted to be compressed or expanded upon contracting the relation of said members 7 and 14, by referring to Fig. 1 of the annexed drawings it will be seen that the fixed rmember 7 of the water pump piston 3 is fastened to the tubular piston rod 6 by a threaded engagement 11 thereto and thereby forms a part of tubular piston rod 6. I fix this rod 6 against longitudinal movement by providing a threaded collar 16 on the solid piston rod 13, this said threaded collar 16 prevents the rod 6 from moving in an outward longitudinal direction, while the upset end 1 of rod 13 prevents it from moving in an opposite direction.

At this time it may be well to state, and to carefully note that one of the most essential elements required for the operation of a positive adjusted piston packing mechanism is a lever 15.

While I have shown a ratchet wrench in Patent No. 1,474,201 to perform this function, any type of wrench may be used to act as a lever 15.

By referring to Fig. 4 of the annexed drawings it will be seen that this lever 15 is located between the steam piston 2 and the water pump piston 3 and is adapted to rotate the tubular piston rod 6 which in turn rotates both members 7 and 14 of piston 3 imparting longitudinal movement to the piston follower 14 relatively to the piston member 7.

The piston member 7 is a cylindrical disc in formation having a conical surface 18 extending from the extreme outside diameter terminating in a centrally disposed hub containing a series of jaws 9 which are adapted to interlock with jaws 10 located on the opposite member 14 of the water pump iston 3. I have fixed this member 7 onto r0 6, and against longitudinal movement.

The piston follower 14, which has the same formation, jaws 10 and conical surface 18 as member 7, is adapted to be moved in a longitudinal direction relatively to member 7.

Through a medium of interlocking jaws 9 and 10, which are plainly illustrated in Fig. 3, the rotation of member 7 simultaneously moves member 14 and as said member or follower14 is rotated on a fixed and stationary threaded end portion 17 of the solid piston rod 13 it suifices to say that it will be moved in a longitudinal direction toward its opposed member 7 when being rotated.

While both members 7 and 14 of the piston 3 are rotating, the piston packing 23 will also have a tendency to' turn due to the friction created by the pressure between it and the conical surfaces 18 of members 7 and 14. By this feature of the members 7 and 14 and the packing 23 constantly changing their wearingplace in the water pump liner 8 each time the packing is adjusted a very important result takes place creating thereby an even wear throughout the entire diameter of the piston packing 23 and the water liner 8.

The interlocking jaws 9 and 10 are a series of circular segments in formation forming a part of members 7 and 14 and are cast integral to each other, (similar to gear teeth) so as to provide perfect interlocking engagement between members 7 and 14, their formation is readily seen by referring to Figures No. 2 and 3.

The packing 23 is a pliable tubular cylinder located between piston members 7 and 14 and mounted on the conical surfaces 18 and the outside diameter of the interlocking jaws 9 and 10 of said members. I have provided conical surfaces on both ends of this packing 23 to co-operate with the conical surfaces of members 7 and 14, so that when the members 7 and 14 are longitudinally adjusted relatively to each other the packing 23 is wedged outward to bear sufficiently against the walls of the water liner 8 inthe reciprocating pump and the fluid pumped in thereby prevented from passing by the pump piston 3. It should be noted that this packing 23 will have a tendency to turn or revolve in co-operation with members 7 and 14 during the adjusting period preventing thereby excessive wear in any one spot in the packing 23 or the water liner 8.

Having now particularly described and ascertained the nature of this invention and in what manner the same is to be performed what I' claim and desire to secure by Letters Patent is:

1. In a reciprocating pump, a pump piston comprising two members one of which is longitudinally adjustable relative to the other,

a packing between said members, a tubular piston rod fixed against longitudinal movement having connection with said members and adapted to be rotated to impart a rotating movement to said members, and means extendin within said tubular rod connected with t e longitudinally adjustable member to shift said member by rotation of saidmemsaid member, a packing between said member longitudinall the relation of said members, a tubular piston rod connected to one of said members, fixed means within the'tubular rod having threaded connection with the other of said members, and a connection between said members to cause them to rotate 'together whereby rotation of said rod will change the relative positions of said members.

- 3. In a reciprocating pump, a pump piston comprising two members one of which is longitudinally adjustable. relative to the other member, a packing between said members adjusted by said relative movement, a pair of rods fixed against longitudinalmovement, one of said rods being connected to one of said members to rotate the same, means for holding the other rod against rotary move ment and said rod having threaded engage- -ment with the other member, and coacting guide means carried by. said members to cause them to rotate together while permitting relative longitudinal .movements.

4. In a pump piston, a piston member and a piston follower adapted to be moved-toward and follower, a fixed rod having screw thread connection with said follower, arotatable rod enclosing the first rod and secured against longitudinal movement, said second rod being secured to said piston member to rotate said member, and coacting means carried b with said member.

5. In a reciprocating pump, a pump piston including a piston member and a piston follower adapted for longitudinal movement relative to said member, a pliable packing between said member and follower, means fixed against rotary movement connected to the follower by means for imparting longitudinal movement thereto by rotation of said follower, and a rotatable rod fixed against longitudinal movement and connected with said member and follower to rotate the same by rotation'of said rod.

" 6. In a reciprocating pump, apump piston including a piston member and a piston follower adapted t9 be moved toward saidjmemher, a pliable packing between said-member and, follower, a rod fixed against rotary movement having threaded engagement .with the.

- follower, a rotatable rod fixed againstlongitudinal movement and connected to the piston member to rotate the same, and means for rotating the follower by rotation of said member.

7. In a pump piston, a piston member, a piston follower adapted to moved toward other, cooperating means on said members to cause them to rotate together, a packing between said members, and means fixed against rotation connected to said adjustable member. and adapted by rotation of said members to shift said adjustable memberrelative to the other member.

- 9. In a pump piston, a piston member and a piston follower adapted to be moved toward said member, said member and follower having opposed conical surfaces, a packing between said members and shifted by change in the relative positions of said conical surfaces, interengaging guide means carried by said member and followerarranged to pre+ vent relative turning movement while permitting relative longitudinal movement, and means fixed against rotation connected to said follower and adapted by rotation of said member and follower to shift said follower toward said member.

10. In a pump piston, a piston member and a piston follower adapted to be moved toward said member, said member and follower having opposed conical surfaces, a. packing between said members and shifted by change in the relative positions of said conical sury faces a member fixed a ainst rotation havin -the member and follower to turn the follower g g screw thread connection, with said-follower, and a rotatable rod secured against longitudinal movement and connected with said having a screw thread connection with the other member, and coacting means carried by said members to cause them to rotate together.

12. In a pump, a plunger rod held against rotation upon'the plunger rod coupling, a'

sleeve disposed aboutthe-plunger rod, a head mounted upon the sleeve, a second head threadedly mounted upon the plunger rod, means for holding the heads against relative rotation, and an expansible packing disposed between the heads whereby upon rotation'of the sleeve said heads may'be caused to rotate 1 together, causing the second head to move either toward or away from the first head to expand the packing or to permit it to contract.

5 13. In a pump having a plunger rod coupling, a plunger rod secured against rotation relatively thereto, a sleeve disposed about the plunger rod having one end bearing against the plunger rod coupling, a jam nut threaded onto the mentioned end of the sleeve, a head rigidlymounted upon the other end of the sleeve, a second head threadedly mounted upon the other end of the plunger rod, means holding the heads against relative rotation, a

packing disposed between the heads and adapted to be expanded when the sleeve is rotated, causing the heads to rotate and causing the second head to move toward the first, and means providing a shoulder on the plung- Q er rod providing an abutment against which the end of the sleeve will abut when the jam nut is tightened against the plunger rod coupling.

14. A pump plunger comprising a piston rod, a sleeve disposed about the piston rod, a head secured to the sleeve, a second head threadedly mounted upon the plunger rod,- means for locking said heads against relative rotation, a packing disposed between the heads, and means providing a shoulder on the plunger rod against which the sleeve abuts.

15. A pump plunger comprising a piston rod, a sleeve disposed about the piston rod, a first head secured to the sleeve, a second head threadedly mounted upon the plunger rod, means for locking said heads against relative rotation, a packing disposed between the heads, and means limiting the endwise movement of the first head and sleeve whereby upon rotation of the first head and sleeve the second head may be adjusted toward or away from the first head.

16. In a pump, a plunger rod held against. rotation upon the plunger rod coupling, a sleeve disposed about the plunger rod, a head mounted upon the sleeve, a second head threadedly mounted upon the plunger rod, means for holding the heads against relative rotation, and an expansible packing disposed between the heads whereby upon rotation of the sleeve said heads may be caused to rotate together, causing the second head to move either toward or away from the first head to expand the packing or to permit it to contract.

17. In a pump having a plunger rod coupling, a plunger rod secured against r0- tation relatively thereto, a sleeve disposed about the plunger rod having one end bearing against the plunger rod coupling, a jam nut threaded ontothe mentioned end of the sleeve, a head rigidly mounted upon the other end of the sleeve, a second head threadedly mounted upon the other end ofthe plunger rod, means 65 holding the heads against relative rotation, a

packing disposed between the heads and adapte to be expanded when the sleeve is notated, causing the heads to rotate and causing the second head to move toward the first, and means providing a shoulder on the plunger rod providing an abutment against which the end of the sleeve will abut when the jam nut is tightened against the plunger rod coupling.

18. A pump plunger comprising a piston rod, a sleeve disposed about the piston rod, a head secured to the sleeve, a second head threadedly mounted upon the plunger rod, means for locking said heads against relative rotation, a packing disposed between the heads, and means providing a shoulder on the plunger rod against which the sleeve abuts.

19. A pump plunger comprising a piston rod, a sleeve disposed about the piston rod, a first head secured to the sleeve, a second head threadedly mounted upon the plunger rod,

means for locking said heads against relative rotation, a packing disposed between the heads, and means limiting the endwise movement of the first head and sleeve whereby upon rotation of the first head and sleeve the second head may be adjusted toward or away from the first head.

In witness that I claim the foregoing I have hereunto subscribed my name this 9th day of April, 1926.

VILLIAM FREDERICK MGMAHON. 

